Flow, level, pressure and water-quality instruments, specified properly
Supmea has built process instruments in Hangzhou for over 20 years. This hub gives you the specifications, comparison tables and straight answers you need to choose the right instrument, and a direct line to the engineers who build it.
What are you trying to measure?
Start from the process problem. Each answer links to the instrument or the selection guide that settles it.
Flow of water, wastewater or chemicals
Conductive liquids from DN10 to DN1000 with no pressure loss.
Steam, compressed air or gas flow
Vortex for steam and utilities, thermal for direct gas mass.
Liquid mass for batching and blending
Coriolis measures mass and density directly, up to ±0.1%.
Level in a tank, sump or channel
60 GHz radar or ultrasonic, depending on vapour, foam and budget.
Pressure and ΔT in a cooling loop
Compact transmitters and Pt100 pairs for CDUs and chilled water.
pH, ORP and dissolved oxygen
Online analyzers with dosing relays and Modbus for SCADA.
Which flow meter fits which fluid?
The first selection question is the medium. This table is the short version of our flow technology comparisons.
| Medium | First choice | Why | Avoid |
|---|---|---|---|
| Water, wastewater, acids, slurry (conductive) | Electromagnetic | No pressure loss, no moving parts, ±0.5% | Turbine in dirty water |
| Deionised water, glycol coolant, light oils | Turbine or ultrasonic | Independent of conductivity | Magmeter below its conductivity limit |
| Saturated or superheated steam | Vortex (compensated) | High temperature, no wear | Thermal mass |
| Compressed air, nitrogen, biogas | Thermal mass | Direct mass, high turndown | Magmeter |
| Any liquid where mass or density matters | Coriolis | Mass, density and temperature in one | Thermal mass (gas-only) |
Instrumentation for data center liquid cooling
AI and HPC racks now exceed what air can remove, so heat is carried by liquid through cold plates or immersion tanks to a coolant distribution unit (CDU) and on to facility water. Every kilowatt removed is calculated from flow × ΔT, so the instruments in that loop decide whether the cooling system can prove its capacity and catch a failing pump before a GPU throttles.
- Turbine and ultrasonic flow for low-conductivity TCS coolant
- Compact SUP-PE100 pressure transmitters with 10 ms response
- Matched Pt100 transmitters for ΔT and kW calculation
- Radar reservoir level and pH trend for leak and coolant-health alarms
Instruments with published specifications
Every product page lists ranges, accuracy, outputs and limits, including where the instrument is the wrong choice.
Electromagnetic Flow Meter
Conductive liquids from DN10 to DN1000 with no moving parts and no pressure loss.
Vortex Flow Meter
Steam, compressed air and clean liquids, DN15–DN300, medium up to 300 °C.
Coriolis Mass Flow Meter
Direct mass flow, density and temperature in one meter, up to ±0.1%.
Thermal Gas Mass Flow Meter
Direct gas mass flow in large ducts and pipes, no T/P compensation needed.
60 GHz Radar Level Meter
Non-contact level for tanks and open water, ±5 mm with a 6° beam.
Compact Pressure Transmitter
Small-format pressure for CDUs, pumps and chilled-water loops.
Online pH/ORP Meter
Panel-mount pH/ORP control with isolated 4–20 mA and dosing relays.
Programmable Temperature Transmitter
Turns RTD or thermocouple signals into a clean two-wire 4–20 mA loop.
Solutions by industry
Measurement points, recommended instruments and design notes for six industries.
Data Center Liquid Cooling
Flow, ΔT, pressure and coolant quality for CDUs, manifolds and facility water.
Water & Wastewater
Flow, level, pH and DO from intake to discharge.
Chemical Processing
Corrosion-resistant measurement for batching, dosing and storage.
Oil & Gas
Fuel gas, liquid allocation, separators and tank farms.
Food & Beverage
Sanitary flow, CIP verification, tank level and utilities.
HVAC & District Energy
Chilled-water plants, cooling towers and energy metering.
Why engineers specify Supmea
Figures from Supmea's company profile and news room.
Specs you can check
Ranges, accuracy, outputs and materials are published per model, with the official datasheet linked from every product page.
Third-party approvals
NSF certification for drinking-water magmeters, UL certifications for the US and Canada, and FieldComm Group (HART) membership, announced in 2025.
Local support
Partners and service centres across Asia, the Middle East, Europe and the Americas, plus a Central Asia service centre opened in 2026. More about Supmea
Engineering Q&A
Direct answers to the selection questions we hear most, with sources.
- Is a thermal mass flow meter suitable for liquids?Flow
No. Standard industrial thermal dispersion mass flow meters, such as the Supmea SUP-MF, are designed and calibrated for clean, dry gases. Liquids remove heat roughly a…
- How do you choose a flow meter for data center liquid cooling?Liquid cooling
Choose by loop and coolant. On the facility water side (FWS), a magnetic flow meter suits conductive chilled water in larger pipes. On the technology cooling side (TCS),…
- Electromagnetic vs ultrasonic flow meter: which should you choose?Flow
Choose an electromagnetic flow meter for conductive liquids (water, wastewater, slurries, chemicals) when you can install a spool piece and want the most stable…
- What is the minimum conductivity for an electromagnetic flow meter?Flow
It depends on the model: many industrial electromagnetic flow meters need at least 5 µS/cm, some specify 20 or 50 µS/cm, and low-conductivity designs work down to about…
- Can a vortex flow meter measure steam accurately?Flow
Yes. Vortex flow meters are one of the most common technologies for saturated and superheated steam because they have no moving parts and tolerate high temperature. A…
- Radar vs ultrasonic level transmitter: which is better?Level
Radar is the better general-purpose choice: microwaves are unaffected by vapour, temperature layering, pressure or wind, and a 60 GHz radar such as the Supmea WSR201 has…
- How often should an online pH sensor be calibrated?Water quality
Most online pH sensors are calibrated every one to four weeks. Clean water applications often hold calibration for a month; wastewater, slurries, oily or…
- Gauge vs absolute vs differential pressure transmitter: what is the difference?Pressure
A gauge pressure transmitter measures relative to local atmospheric pressure (0 when open to air). An absolute transmitter measures relative to a perfect vacuum, so it…
Get a selection and quotation from an application engineer
Send the medium, pipe size, flow or level range, temperature, pressure and required output. You'll get a recommended model, the datasheet and a quotation.
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- +86 133 6211 7863
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